Calculatl ng device



BEST AVAILABLE COP" '(No Model.)

L. MAYBAUM.

CALCULATING DEVICE.

N0. 60,6.000. Patented M 31,1898.

iNVENTUR i j y 36 um WITNESSES:

0W BY WMMMW ATTYS.

BE T AVAILABLE COP UN TED STATES PATENT OFFICE.-

LEVY MAYBAUM, or lxinwnnn, NEW .mnsnv.

cALo u LATING D EVlC E.

SPECIFICATIQN such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification; a i

The object of my present invention is to provide a simple, reliable, and elficient device for adding, subtracting, and multiplying, & c., ofany number of figures, which device will be'fouud of'greati advantage and utility in schools, stores, accountants ofliees, and in general wherever extensive calculations have to be made. The invention consists in the improved cal: culator, in its revolving graduated disk cooperating with a stationar scale and pivoted pointer, and in the combination and arrangements of the various parts, substantially as will be hereinafter more fully described, and finally embodied in the clauses of the claim. Referring to the accompanying drawings, in which like letters of reference indicate corresponding parts in each of the fseveral' views, Figure 1 is a top plan view of my improved calcnlating deviceaFig; 2, a sectional view on the line a: w of Big. 1; Fig. 3, an enlarged front elevation of the spring-controlled pointer; and Fig. 4, across-sectional view through the latter, illustrating its engaging means with the teeth of the revolving disk.

In said drawings, a-tepresen ts a fra-i ne-plate or bed provided with a'circular recess b, having at or near it outer periphery an annular groove or channel 0, in which are arranged a series of balls d, adapted to'form a suitable bearing for the disk 6. Said-disk is rcvolubly monntcdon the central vertical pin or stud f, provided with a head g, and also serving as a fulcrum for the hand or pointer 71, which latter can be operated and turned indcpendent of the revolving disk (2.

The disk c is provided with a series of forming part of Letters Patent No. 5,090, dated May 31, 1898.

Serial No. 643,195. (No model.)

concentrically-arranged rings 6' 6 e containing graduation -marks from 1 to 500, from 500 to 1000,? and from 1000 to 1500, respectively, and is also provided with an annular rack-bar m, concentrically having its teeth conforming to and in alinement with the graduation-marks on said rings. The teeth of said rack-bar are adapted to be carried by and projecting downwardly from the hand or pointer h, which latter is provided with a knob or handle it and is kept, with bar m by means of a spring ii, carried by said hand or pointer h and slidingly arranged 011 the frame-plate or bed a, as clearly illustrated in thedrawings. On one side of said frame plate or bed is arranged a scale o, provided with graduation-marks from 0'to 100 and on each end of said sealeis a stop 1) and q of any suitable construction and adapted to limit the motion of the hand or pointer 72, as will vbe hereinafter described. Diametrically opposite the center of said scale 0 and arranged on the frame-plate orbcd-ain any desired manner is a pointer or arrow 3, forming the starting or zero point when calculations are to be made, and for that purpose the pointer or arrow '1' on the disk 6 is to be brought in alineinent with said pointer or arrow .9, as will be manifest.

On the disk e is arranged in anydcsircd manner an upwardly-extending pin or stud i, adapted to engage the arms u u 11*, respcctivcly, which arms project from a hand or pointer n pivotally secured, as at a, to the frame-plate or bed a and adapted to indicate the figures 500, 1000, ane1500-1h.-it is to say, that the disk has been related once, twice, and three limes, respectively. The .disk 8 is also provided :itn suitable. place with aldcpression a for conveniently returning said disk to its n mal position, and it will be manifest that more than one of said dopressions (or slight projections) can be arranged on said disk, if so desired.

It is very essential for the accurate working of the device that the pin it be slightly curved or bent at its lower end, so that said bill is bound to cngwc the ocnlcr of its re- 1 s engaged by a slightly curved or bent pin it,

its pin 11, out of engagement with the rack-.

arranged with the annular rings e e e and position-that is to say,

BEST AVAILABLE CQP spective notch, (formed on the rack-bar 12,) especially when the device is being rapidly operated.

In operation when a series of columns of figures are to be added the disk e is first returned to its normal position-that is to say, the pointer or arrow 7" is broughtin alinement with the arrow or pointer s. The indicator or-pointer a is also returned to its normal is set to 'pointatzero the position indicated in Fig. 1 of the draw- J ings. Supposing now the following column is to be added: 7 6713 2776 39 99 Said column is divided up into two columns,

right-hand column in the following of which the thus formed is added first manner:- The pointer his mo've'tl gto graduation-mark 99 on scale 0 and isjthen pressed downward until its pin n firmly lengages the respective notch in the rack-liar m of disk The pointeris kept in eachcontaining twofigures,

depressed position and moved backwardthatisjto'say,--from left to rightfuntil' it is isinoved from I stopped by the stop q. that moment pointat $99 sition and the operation {he arrow .9 will at on the outer ring e ofsaid disk e. 1 The pointer is then released from its engagement with the rack-barmand right to left to the grad nationmark 76, (on the scale 0,) when it isagain brought into engagement with the disk 6 and moved backward to the stop q. The arrow s will point atg'raduation-mark 175 of the outer ring e. By again moving the pointer h to mark 13 on scale 0, bringing said pointer into engagement with the disk 8 and turning the latter backward until the pointer the arrow 8 will point the sum of the double column just added. The disk e is 'nowreturned to its normal po as above described regarding the right-hand 'column is now re- .peated with the left-hand column; but it must be remarked ,that in setting'the pointer h for the first figure 39 one is added-that is to say, the pointer is set.- at graduation-mark 40 on the scale,

so-called carrying offigurcs in the ordinary adding of columns. However, should, for in stance, the figure to be carried be a double figmfetlike 69 and the fi'rstfignre of the second double column will in addition to that double figure amount to more than one hundrd, then the pointer h is moved to that lastln tioned double figure on the scale 0, and is then brought into engagement with the disk e has made one complete sisting of a'dial and a and corresponds to the and turned backward to the stop q.. The arrow 3 will indicate said last-m ention ed double figure on one of the rings of the disk 9. he further operation of adding is then the same as heretofore described Vhenever the disk 6 has engaged the-arms u and moved the pointer u to mark 500, and a second and third revolution of said disk e will bringsaid pointer u to the marks i000 and 1500, respectively, as will be manifest.

When the device is to he used for subtracting, the operation heretofore described is reversed, and it may also be remarked that the same device can be used for multiplying by operating the pointer and disk in a manner similar to that of adding.

I do not intend to limit myself to the precise construction as shown and described, as

various alterations can be made without changing the scope of my invention; but

Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In a calculator,

rack, of a pointerpivotally movable with reference to a fixed erally-projecting supporting-armssecured at its free end and' with a pin-n having a defiected end and adapted to engage the teeth of said rack, substantially as described.

-' 2. In a calculator, the combination with the .frame or bed plate, of a revolnbledisk provided with graduated iudices and having ballbearings arranged in said frame, a stationary scale arranged concentrically to said disk on said frame, an operating hand or pointer for said disk pivoted on the movable independentlythereof, flexible supporting-arms for the free end of said pointer, an annular rack-bar carried by: said disk, a pin secured to the free end of said hand or pointer and having a deflected end adapted to engage the rack-rod stops for said point-er, a pointer 8 arranged on the frame at a point remote from the stationary scale, a depression a in said plate, a disk, and ang'auxiliary indicating mechanism adapted to be operated by said disk and eonpointer therefor havadapted to be succesby saidpin 15, substantially as ing a series of arms sively engaged described;

In testimony that I claim the foregoing I have herennto-set-my hand this 30th day of June, 1897; LEVY MAYBAUM.

lVitn esses:

- ALFRED GARTNERQ N. PARKER.

pivot thereof and revolution, the pin t the combination withamovable indicating element provided with a scale and provided with latpin 6 carried by said i 

